Current Electricity

325 questions · Physics · JEE Main

Current Electricity

325 questions · Physics · JEE Main

The battery of a mobile phone is rated as $4.2 V, 5800 mAh$ . How much energy is stored ir it when fully charged?2025 · 2 Apr · Shift 1 · Q67 · MCQ
A wire of length 25 m and cross-sectional area $5 mm^{2}$ having resistivity of $2 \times 1 0^{- 6} Ω m$ is bent into a complete circle. The resistance between diametrically opposite points will be2025 · 3 Apr · Shift 1 · Q53 · MCQ
In the figure shown below, a resistance of $150.4Ω$ is connected in series to an ammeter A of resistance $240Ω$ . A shunt resistance of $10Ω$ is connected in parallel with the ammeter. The reading of the ammeter is … Includes diagram2025 · 3 Apr · Shift 1 · Q71 · Numerical
A motor operating on 100 V draws a current of 1 A . If the efficiency of the motor is $91.6%$ , then the loss of power in units of $cal / s$ is2025 · 3 Apr · Shift 2 · Q59 · MCQ
Two cells of emfs 1 V and 2 V and internal resistances $2Ω$ and $1Ω$ , respectively, are connected in series with an external resistance of $6Ω$ . The total current in the circuit is $I_{1}$ . Now the same two cells in…2025 · 3 Apr · Shift 2 · Q73 · Numerical
Current passing through a wire as function of time is given as $I (t) = 0.02 t + 0.01 A$ . The charge that will flow through the wire from $t = 1 s$ to $t = 2 s$ is2025 · 4 Apr · Shift 1 · Q55 · MCQ
There are ' $n$ ' number of identical electric bulbs, each is designed to draw a power $p$ independently from the mains supply. They are now joined in series across the mains supply. The total power drawn by the combination is :2025 · 4 Apr · Shift 2 · Q67 · MCQ
From the combination of resistors with resistances values $R_{1} = R_{2} = R_{3} = 5Ω$ and $R_{4} = 10Ω$ , which of the following combination is the best circuit to get an equivalent resistance of $6Ω$ ?2025 · 4 Apr · Shift 2 · Q68 · MCQ
A wire of resistance $R$ is bent into a triangular pyramid as shown in figure with each segment having same length. The resistance between points $A$ and $B$ is $R / n$ . The value of $n$ is : Includes diagram2025 · 7 Apr · Shift 1 · Q58 · MCQ
Given below are two statements : Statement-I : The equivalent emf of two nonideal batteries connected in parallel is smaller than either of the two emfs. Statement-II : The equivalent internal resistance of two nonideal batteries connected…2025 · 22 Jan · Shift 1 · Q61 · MCQ
Which of the following resistivity ( $ρ$ ) $v / s$ temperature ( T ) curves is most suitable to be used in wire bound standard resistors?2025 · 22 Jan · Shift 1 · Q65 · MCQ
Sliding contact of a potentiometer is in the middle of the potentiometer wire having resistance $R_{p} = 1Ω$ as shown in the figure. An external resistance of $R_{e} = 2Ω$ is connected via the sliding contact. The electric current in… Includes diagram2025 · 22 Jan · Shift 1 · Q69 · MCQ
The net current flowing in the given circuit is A. Includes diagram2025 · 22 Jan · Shift 2 · Q72 · Numerical
Consider a moving coil galvanomenter (MCG): A. The torsional constant in moving coil galvanometer has dimensions $[ML^{2} T^{- 2}]$ B. Increasing the current sensitivity may not necessarily increase the voltage…2025 · 23 Jan · Shift 1 · Q66 · MCQ
A galvanometer having a coil of resistance $30Ω$ need 20 mA of current for full-scale deflection. If a maximum current of 3 A is to be measured using this galvanometer, the resistance of the shunt to be added to the galvanometer…2025 · 23 Jan · Shift 2 · Q70 · MCQ
A wire of resistance $9Ω$ is bent to form an equilateral triangle. Then the equivalent resistance across any two vertices will be ohm.2025 · 24 Jan · Shift 1 · Q71 · Numerical
Find the equivalent resistance between two ends of the following circuit Includes diagram2025 · 28 Jan · Shift 1 · Q56 · MCQ
A wire of resistance R is bent into an equilateral triangle and an identical wire is bent into $a$ square. The ratio of resistance between the two end points of an edge of the triangle to that of the square is2025 · 28 Jan · Shift 1 · Q59 · MCQ
In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage $V_{A B}$ is correctly represented by: Includes diagram2025 · 28 Jan · Shift 2 · Q53 · MCQ
The value of current I in the electrical circuit as given below, when potential at A is equal to the potential at B, will be A. Includes diagram2025 · 28 Jan · Shift 2 · Q74 · Numerical
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Choke coil is simply a coil having a large inductance but a small resistance. Choke coils are used with fluorescent…2025 · 29 Jan · Shift 1 · Q75 · MCQ
The reading in the ideal voltmeter $(V)$ shown in the given circuit diagram is : Includes diagram2024 · 1 Feb · Shift 1 · Q68 · MCQ
A galvanometer has a resistance of $50 Ω$ and it allows maximum current of $5 mA$ . It can be converted into voltmeter to measure upto $100 V$ by connecting in series a resistor of resistance :2024 · 1 Feb · Shift 1 · Q69 · MCQ
The current in a conductor is expressed as $I = 3 t^{2} + 4 t^{3}$ , where $I$ is in Ampere and $t$ is in second. The amount of electric charge that flows through a section of the conductor during $t = 1 s$ to $t = 2 s$ is …2024 · 1 Feb · Shift 1 · Q90 · Numerical
In a metre-bridge when a resistance in the left gap is $2Ω$ and unknown resistance in the right gap, the balance length is found to be $40 cm$ . On shunting the unknown resistance with $2Ω$ , the balance length changes…2024 · 1 Feb · Shift 2 · Q69 · MCQ
In an ammeter, $5%$ of the main current passes through the galvanometer. If resistance of the galvanometer is $G$ , the resistance of ammeter will be :2024 · 1 Feb · Shift 2 · Q79 · MCQ
To measure the internal resistance of a battery, potentiometer is used. For $R = 10Ω$ , the balance point is observed at $l = 500 cm$ and for $R = 1Ω$ the balance point is observed at $l = 400 cm$ . The…2024 · 4 Apr · Shift 1 · Q79 · MCQ
Twelve wires each having resistance $2Ω$ are joined to form a cube. A battery of $6 V$ emf is joined across point $a$ and $c$ . The voltage difference between $e$ and $f$ is V. Includes diagram2024 · 4 Apr · Shift 1 · Q89 · Numerical
An electric bulb rated $50 W - 200 V$ is connected across a $100 V$ supply. The power dissipation of the bulb is:2024 · 4 Apr · Shift 2 · Q78 · MCQ
Two wires $A$ and $B$ are made up of the same material and have the same mass. Wire $A$ has radius of $2.0 mm$ and wire $B$ has radius of $4.0 mm$ . The resistance of wire $B$ is $2Ω$ . The resistance of wire $A$ is…2024 · 4 Apr · Shift 2 · Q88 · Numerical
In the given figure $R_{1} = 10Ω, R_{2} = 8Ω, R_{3} = 4Ω$ and $R_{4} = 8Ω$ . Battery is ideal with emf $12 V$ . Equivalent resistant of the circuit and current supplied by battery are… Includes diagram2024 · 5 Apr · Shift 1 · Q69 · MCQ
In the experiment to determine the galvanometer resistance by half-deflection method, the plot of $1/ θ$ vs the resistance (R) of the resistance box is shown in the figure. The figure of merit of the galvanometer is … Includes diagram2024 · 5 Apr · Shift 1 · Q85 · Numerical
The ratio of heat dissipated per second through the resistance $5Ω$ and $10Ω$ in the circuit given below is: Includes diagram2024 · 5 Apr · Shift 2 · Q74 · MCQ
A galvanometer of resistance $100Ω$ when connected in series with $400Ω$ measures a voltage of upto $10 V$ . The value of resistance required to convert the galvanometer into ammeter to read upto $10 A$ is $x \times 1 0^{- 2} Ω$ …2024 · 5 Apr · Shift 2 · Q78 · MCQ
A wire of resistance $20Ω$ is divided into 10 equal parts, resulting pairs. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent…2024 · 5 Apr · Shift 2 · Q85 · Numerical
The value of unknown resistance $(x)$ for which the potential difference between $B$ and $D$ will be zero in the arrangement shown, is : Includes diagram2024 · 6 Apr · Shift 1 · Q66 · MCQ
A wire of resistance $R$ and radius $r$ is stretched till its radius became $r /2$ . If new resistance of the stretched wire is $x R$ , then value of $x$ is .2024 · 6 Apr · Shift 1 · Q88 · Numerical
The number of electrons flowing per second in the filament of a $110 W$ bulb operating at $220 V$ is : (Given $e = 1.6 \times 1 0^{- 19} C$ )2024 · 6 Apr · Shift 2 · Q64 · MCQ
In the given figure an ammeter A consists of a $240Ω$ coil connected in parallel to a $10Ω$ shunt. The reading of the ammeter is $mA$ . Includes diagram2024 · 6 Apr · Shift 2 · Q82 · Numerical
In the given circuit, the terminal potential difference of the cell is : Includes diagram2024 · 8 Apr · Shift 1 · Q79 · MCQ
Resistance of a wire at $0^{\circ} C, 10 0^{\circ} C$ and $t^{\circ} C$ is found to be $10Ω, 10.2Ω$ and $10.95Ω$ respectively. The temperature $t$ in Kelvin scale is .2024 · 8 Apr · Shift 1 · Q87 · Numerical
Water boils in an electric kettle in 20 minutes after being switched on. Using the same main supply, the length of the heating element should be to times of its initial length if the…2024 · 8 Apr · Shift 2 · Q66 · MCQ
A heater is designed to operate with a power of $1000 W$ in a $100 V$ line. It is connected in combination with a resistance of $10Ω$ and a resistance $R$ , to a $100 V$ mains as shown in figure. For the… Includes diagram2024 · 8 Apr · Shift 2 · Q87 · Numerical
A galvanometer has a coil of resistance $200Ω$ with a full scale deflection at $20 μ A$ . The value of resistance to be added to use it as an ammeter of range $(0 - 20) mA$ is :2024 · 9 Apr · Shift 1 · Q62 · MCQ
The equivalent resistance between A and B is : Includes diagram2024 · 9 Apr · Shift 1 · Q77 · MCQ
The current flowing through the $1Ω$ resistor is $\frac{n}{10}$ A. The value of $n$ is . Includes diagram2024 · 9 Apr · Shift 1 · Q90 · Numerical
The effective resistance between $A$ and $B$ , if resistance of each resistor is $R$ , will be : Includes diagram2024 · 9 Apr · Shift 2 · Q61 · MCQ
To determine the resistance (R) of a wire, a circuit is designed below. The $V$ - $I$ characteristic curve for this circuit is plotted for the voltmeter and the ammeter readings as shown in figure. The value of $R$ is … Includes diagram2024 · 9 Apr · Shift 2 · Q83 · Numerical
At room temperature $(2 7^{\circ} C)$ , the resistance of a heating element is $50Ω$ . The temperature coefficient of the material is $2.4 \times 1 0^{- 4}^{\circ} C^{- 1}$ . The temperature of the element, when its…2024 · 9 Apr · Shift 2 · Q87 · Numerical
A wire of length $10 cm$ and radius $7 \times 1 0^{- 4} m$ connected across the right gap of a meter bridge. When a resistance of $4.5Ω$ is connected on the left gap by using a resistance box, the balance…2024 · 27 Jan · Shift 1 · Q78 · MCQ
A wire of resistance $R$ and length $L$ is cut into 5 equal parts. If these parts are joined parallely, then resultant resistance will be :2024 · 27 Jan · Shift 1 · Q79 · MCQ
Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across $A$ and $B$ , their readings are $V_{1}, V_{2}$ and $V_{3}$ . Choose the correct option. Includes diagram2024 · 27 Jan · Shift 2 · Q72 · MCQ
A current of $200 μ A$ deflects the coil of a moving coil galvanometer through $6 0^{\circ}$ . The current to cause deflection through $\frac{π}{10}$ radian is :2024 · 27 Jan · Shift 2 · Q79 · MCQ
Wheatstone bridge principle is used to measure the specific resistance $(S_{1})$ of given wire, having length $L$ , radius $r$ . If $X$ is the resistance of wire, then specific resistance is ; $S_{1} = X (\frac{π r ^{2}}{L})$ …2024 · 27 Jan · Shift 2 · Q80 · MCQ
The deflection in moving coil galvanometer falls from 25 divisions to 5 division when a shunt of $24Ω$ is applied. The resistance of galvanometer coil will be :2024 · 29 Jan · Shift 1 · Q64 · MCQ
A galvanometer having coil resistance $10Ω$ shows a full scale deflection for a current of $3 mA$ . For it to measure a current of $8 A$ , the value of the shunt should be:2024 · 29 Jan · Shift 1 · Q67 · MCQ
The electric current through a wire varies with time as $I = I_{0} + β t$ , where $I_{0} = 20 A$ and $β = 3 A / s$ . The amount of electric charge crossed through a section of the wire in $20 s$ is :2024 · 29 Jan · Shift 1 · Q78 · MCQ
In the given circuit, the current in resistance R $_{3}$ is : Includes diagram2024 · 29 Jan · Shift 2 · Q62 · MCQ
In the given circuit, the current flowing through the resistance $20Ω$ is $0.3 A$ , while the ammeter reads $0.9 A$ . The value of $R_{1}$ is $Ω$ . Includes diagram2024 · 29 Jan · Shift 2 · Q81 · Numerical
A potential divider circuit is shown in figure. The output voltage V $_{0}$ is : Includes diagram2024 · 30 Jan · Shift 1 · Q73 · MCQ
An electric toaster has resistance of $60Ω$ at room temperature $(2 7^{\circ} C)$ . The toaster is connected to a $220 V$ supply. If the current flowing through it reaches $2.75 A$ , the…2024 · 30 Jan · Shift 1 · Q77 · MCQ
Two cells are connected in opposition as shown. Cell $E_{1}$ is of $8 V$ emf and $2Ω$ internal resistance; the cell $E_{2}$ is of $2 V$ emf and $4Ω$ internal resistance. The terminal potential… Includes diagram2024 · 30 Jan · Shift 1 · Q82 · Numerical
When a potential difference $V$ is applied across a wire of resistance $R$ , it dissipates energy at a rate $W$ . If the wire is cut into two halves and these halves are connected mutually parallel across the same supply, the energy…2024 · 30 Jan · Shift 2 · Q68 · MCQ
Two resistance of $100Ω$ and $200Ω$ are connected in series with a battery of $4 V$ and negligible internal resistance. A voltmeter is used to measure voltage across $100Ω$ resistance, which gives reading as $1 V$ …2024 · 30 Jan · Shift 2 · Q86 · Numerical
Two conductors have the same resistances at $0^{\circ} C$ but their temperature coefficients of resistance are $α_{1}$ and $α_{2}$ . The respective temperature coefficients for their series and parallel combinations are :2024 · 31 Jan · Shift 1 · Q75 · MCQ
Equivalent resistance of the following network is $Ω$ . Includes diagram2024 · 31 Jan · Shift 1 · Q89 · Numerical
By what percentage will the illumination of the lamp decrease if the current drops by 20%?2024 · 31 Jan · Shift 2 · Q68 · MCQ
The resistance per centimeter of a meter bridge wire is $r$ , with $X Ω$ resistance in left gap. Balancing length from left end is at $40 cm$ with $25Ω$ resistance in right gap. Now the wire is replaced by another wire…2024 · 31 Jan · Shift 2 · Q75 · MCQ
In the following circuit, the battery has an emf of $2 V$ and an internal resistance of $\frac{2}{3} Ω$ . The power consumption in the entire circuit is W. Includes diagram2024 · 31 Jan · Shift 2 · Q83 · Numerical
The equivalent resistance between $A$ and $B$ of the network shown in figure; Includes diagram2023 · 1 Feb · Shift 1 · Q49 · MCQ
Given below are two statements : One is labelled as Assertion $A$ and the other is labelled as Reason $R$ . Assertion A : For measuring the potential difference across a resistance of $600Ω$ , the voltmeter with…2023 · 1 Feb · Shift 2 · Q47 · MCQ
Equivalent resistance between the adjacent corners of a regular n-sided polygon of uniform wire of resistance R would be :2023 · 1 Feb · Shift 2 · Q50 · MCQ
In the given circuit, the value of $\frac{I _{1} + I _{3}}{I _{2}}$ is Includes diagram2023 · 1 Feb · Shift 2 · Q73 · Numerical
The length of a metallic wire is increased by $20%$ and its area of cross section is reduced by $4%$ . The percentage change in resistance of the metallic wire is .2023 · 6 Apr · Shift 1 · Q68 · Numerical
Figure shows a part of an electric circuit. The potentials at points $a, b$ and $c$ are $30 V, 12 V$ and $2 V$ respectively. The current through the $20 Ω$ resistor will be, Includes diagram2023 · 6 Apr · Shift 2 · Q53 · MCQ
A student is provided with a variable voltage source $V$ , a test resistor $R_{T} = 10 Ω$ , two identical galvanometers $G_{1}$ and $G_{2}$ and two additional resistors, $R_{1} = 10 M Ω$ and $R_{2} = 0.001 Ω$ . For…2023 · 6 Apr · Shift 2 · Q59 · MCQ
As shown in the figure, the voltmeter reads $2 V$ across $5 Ω$ resistor. The resistance of the voltmeter is $Ω$ . Includes diagram2023 · 6 Apr · Shift 2 · Q68 · Numerical
A current of $2 A$ flows through a wire of cross-sectional area $25.0 mm^{2}$ . The number of free electrons in a cubic meter are $2.0 \times 1 0^{28}$ . The drift velocity of the electrons is $\times 1 0^{- 6} ms^{- 1}$ …2023 · 8 Apr · Shift 1 · Q68 · Numerical
The equivalent resistance between A and B as shown in figure is: Includes diagram2023 · 8 Apr · Shift 2 · Q49 · MCQ
The number density of free electrons in copper is nearly $8 \times 1 0^{28} m^{- 3}$ . A copper wire has its area of cross section $= 2 \times 1 0^{- 6} m^{2}$ and is carrying a current of $3.2 A$ . The drift speed…2023 · 8 Apr · Shift 2 · Q58 · Numerical
The equivalent resistance of the circuit shown below between points a and b is : Includes diagram2023 · 10 Apr · Shift 1 · Q56 · MCQ
10 resistors each of resistance 10 $Ω$ can be connected in such as to get maximum and minimum equivalent resistance. The ratio of maximum and minimum equivalent resistance will be .2023 · 10 Apr · Shift 1 · Q67 · Numerical
A rectangular parallelopiped is measured as $1 cm \times 1 cm \times 100 cm$ . If its specific resistance is $3 \times 1 0^{- 7} Ω m$ , then the resistance between its two opposite rectangular…2023 · 10 Apr · Shift 2 · Q63 · Numerical
Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced in same time for parallel to series will be:2023 · 11 Apr · Shift 1 · Q64 · MCQ
The current sensitivity of moving coil galvanometer is increased by $25%$ . This increase is achieved only by changing in the number of turns of coils and area of cross section of the wire while keeping the resistance of galvanometer coil…2023 · 11 Apr · Shift 1 · Q66 · MCQ
In the circuit diagram shown in figure given below, the current flowing through resistance $3 Ω$ is $\frac{x}{3} A$ . The value of $x$ is Includes diagram2023 · 11 Apr · Shift 1 · Q76 · Numerical
The current flowing through R $_{2}$ is : Includes diagram2023 · 11 Apr · Shift 2 · Q43 · MCQ
Two identical cells each of emf $1.5 V$ are connected in series across a $10 Ω$ resistance. An ideal voltmeter connected across $10 Ω$ resistance reads $1.5 V$ . The internal resistance of each cell is $Ω$ …2023 · 11 Apr · Shift 2 · Q70 · Numerical
A wire of resistance $160 Ω$ is melted and drawn in a wire of one-fourth of its length. The new resistance of the wire will be2023 · 12 Apr · Shift 1 · Q55 · MCQ
The current flowing through a conductor connected across a source is $2 A$ and 1.2 $A$ at $0^{\circ} C$ and $10 0^{\circ} C$ respectively. The current flowing through the conductor at $5 0^{\circ} C$ …2023 · 12 Apr · Shift 1 · Q63 · Numerical
Different combination of 3 resistors of equal resistance $R$ are shown in the figures. The increasing order for power dissipation is: Includes diagram2023 · 13 Apr · Shift 1 · Q59 · MCQ
When a resistance of $5 Ω$ is shunted with a moving coil galvanometer, it shows a full scale deflection for a current of $250 mA$ , however when $1050 Ω$ resistance is connected with it in series, it gives full scale…2023 · 13 Apr · Shift 1 · Q64 · Numerical
A potential $V_{0}$ is applied across a uniform wire of resistance $R$ . The power dissipation is $P_{1}$ . The wire is then cut into two equal halves and a potential of $V_{0}$ is applied across the length of each half. The total…2023 · 13 Apr · Shift 1 · Q67 · Numerical
For designing a voltmeter of range $50 V$ and an ammeter of range $10 mA$ using a galvanometer which has a coil of resistance $54Ω$ showing a full scale deflection for $1 mA$ as in figure. (A) for… Includes diagram2023 · 15 Apr · Shift 1 · Q57 · MCQ
Given below are two statements: Statement I : The equivalent resistance of resistors in a series combination is smaller than least resistance used in the combination. Statement II : The resistivity of the material is independent of…2023 · 15 Apr · Shift 1 · Q59 · MCQ
A network of four resistances is connected to $9 V$ battery, as shown in figure. The magnitude of voltage difference between the points $A$ and $B$ is $V$ . Includes diagram2023 · 15 Apr · Shift 1 · Q69 · Numerical
As shown in the figure, a network of resistors is connected to a battery of 24V with an internal resistance of 3 $Ω$ . The currents through the resistors R $_{4}$ and R $_{5}$ are I $_{4}$ and I $_{5}$ respectively. The values of I $_{4}$ and I $_{5}$ … Includes diagram2023 · 24 Jan · Shift 1 · Q56 · MCQ
A hollow cylindrical conductor has length of 3.14 m, while its inner and outer diameters are 4 mm and 8 mm respectively. The resistance of the conductor is $n \times 1 0^{- 3} Ω$ . If the resistivity of the material is $2.4 \times 1 0^{- 8} Ωm$ …2023 · 24 Jan · Shift 1 · Q63 · Numerical
A cell of emf 90 V is connected across series combination of two resistors each of 100 $Ω$ resistance. A voltmeter of resistance 400 $Ω$ is used to measure the potential difference across each resistor. The reading of the…2023 · 24 Jan · Shift 2 · Q48 · MCQ
If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is %.2023 · 24 Jan · Shift 2 · Q68 · Numerical
A uniform metallic wire carries a current 2 A, when 3.4 V battery is connected across it. The mass of uniform metallic wire is 8.92 $\times$ 10 $^{- 3}$ kg, density is 8.92 $\times$ 10 $^{3}$ kg/m $^{3}$ and resistivity is 1.7 $\times$ 10 $^{- 8} Ω$ …2023 · 25 Jan · Shift 1 · Q57 · MCQ
In the given circuit, the equivalent resistance between the terminal A and B is $Ω$ . Includes diagram2023 · 25 Jan · Shift 1 · Q71 · Numerical
The resistance of a wire is 5 $Ω$ . It's new resistance in ohm if stretched to 5 times of it's original length will be :2023 · 25 Jan · Shift 2 · Q58 · MCQ
Two cells are connected between points A and B as shown. Cell 1 has emf of 12 V and internal resistance of 3 $Ω$ . Cell 2 has emf of 6V and internal resistance of 6 $Ω$ . An external resistor R of 4 $Ω$ is connected across A… Includes diagram2023 · 25 Jan · Shift 2 · Q69 · Numerical
Ratio of thermal energy released in two resistors R and 3R connected in parallel in an electric circuit is :2023 · 29 Jan · Shift 1 · Q65 · MCQ
In a metre bridge experiment the balance point is obtained if the gaps are closed by 2 $Ω$ and 3 $Ω$ . A shunt of X $Ω$ is added to 3 $Ω$ resistor to shift the balancing point by 22.5 cm. The value of X is …2023 · 29 Jan · Shift 1 · Q68 · Numerical
When two resistance $R_{1}$ and $R_{2}$ connected in series and introduced into the left gap of a meter bridge and a resistance of 10 $Ω$ is introduced into the right gap, a null point is found at 60 cm from left side.…2023 · 29 Jan · Shift 2 · Q70 · Numerical
The charge flowing in a conductor changes with time as $Q (t) = α t - β t^{2} + γ t^{3}$ . Where $α, β$ and $γ$ are constants. Minimum value of current is :2023 · 30 Jan · Shift 1 · Q47 · MCQ
In the following circuit, the magnitude of current I1, is A. Includes diagram2023 · 30 Jan · Shift 1 · Q59 · Numerical
The equivalent resistance between $A$ and $B$ is . Includes diagram2023 · 30 Jan · Shift 2 · Q51 · MCQ
If the potential difference between $B$ and $D$ is zero, the value of $x$ is $\frac{1}{n} Ω$ . The value of $n$ is . Includes diagram2023 · 30 Jan · Shift 2 · Q65 · Numerical
The drift velocity of electrons for a conductor connected in an electrical circuit is $V_{d}$ . The conductor in now replaced by another conductor with same material and same length but double the area of cross section.…2023 · 31 Jan · Shift 1 · Q53 · MCQ
Two identical cells, when connected either in parallel or in series gives same current in an external resistance $5 Ω$ . The internal resistance of each cell will be $Ω$ .2023 · 31 Jan · Shift 1 · Q73 · Numerical
The number of turns of the coil of a moving coil galvanometer is increased in order to increase current sensitivity by $50%$ . The percentage change in voltage sensitivity of the galvanometer will be :2023 · 31 Jan · Shift 2 · Q49 · MCQ
The $H$ amount of thermal energy is developed by a resistor in $10 s$ when a current of $4 A$ is passed through it. If the current is increased to $16 A$ , the thermal energy developed by the resistor…2023 · 31 Jan · Shift 2 · Q51 · MCQ
Two identical cells each of emf 1.5 V are connected in parallel across a parallel combination of two resistors each of resistance 20 $Ω$ . A voltmeter connected in the circuit measures 1.2 V. The internal resistance of each cell is :2022 · 24 Jun · Shift 1 · Q46 · MCQ
What will be the most suitable combination of three resistors A = 2 $Ω$ , B = 4 $Ω$ , C = 6 $Ω$ so that $(\frac{22}{3})$ $Ω$ is equivalent resistance of combination?2022 · 24 Jun · Shift 2 · Q51 · MCQ
Which of the following physical quantities have the same dimensions?2022 · 25 Jul · Shift 1 · Q42 · MCQ
In the given figure, the value of Vo will be V. Includes diagram2022 · 25 Jul · Shift 1 · Q66 · Numerical
Eight copper wire of length $l$ and diameter $d$ are joined in parallel to form a single composite conductor of resistance $R$ . If a single copper wire of length $2 l$ have the same resistance $(R)$ then its diameter will be …2022 · 25 Jul · Shift 1 · Q67 · Numerical
A current of 15 mA flows in the circuit as shown in figure. The value of potential difference between the points A and B will be: Includes diagram2022 · 25 Jul · Shift 2 · Q55 · MCQ
A teacher in his physics laboratory allotted an experiment to determine the resistance (G) of a galvanometer. Students took the observations for $\frac{1}{3}$ deflection in the galvanometer. Which of the below is true for measuring value…2022 · 25 Jun · Shift 1 · Q61 · MCQ
A resistor develops 300 J of thermal energy in 15 s, when a current of 2 A is passed through it. If the current increases to 3 A, the energy developed in 10 s is J.2022 · 25 Jun · Shift 1 · Q67 · Numerical
The total current supplied to the circuit as shown in figure by the 5 V battery is A. Includes diagram2022 · 25 Jun · Shift 1 · Q68 · Numerical
Two cells of same emf but different internal resistances r1 and r2 are connected in series with a resistance R. The value of resistance R, for which the potential difference across second cell is zero, is :2022 · 25 Jun · Shift 2 · Q54 · MCQ
If n represents the actual number of deflections in a converted galvanometer of resistance G and shunt resistance S. Then the total current I when its figure of merit is K will be:2022 · 25 Jun · Shift 2 · Q63 · MCQ
The length of a given cylindrical wire is increased to double of its original length. The percentage increase in the resistance of the wire will be %.2022 · 25 Jun · Shift 2 · Q71 · Numerical
The current I in the given circuit will be : Includes diagram2022 · 26 Jul · Shift 1 · Q53 · MCQ
Resistances are connected in a meter bridge circuit as shown in the figure. The balancing length $l_{1}$ is $40 cm$ . Now an unknown resistance $x$ is connected in series with $P$ and new balancing length is found to be $80 cm$ … Includes diagram2022 · 26 Jul · Shift 1 · Q68 · Numerical
A battery of $6 V$ is connected to the circuit as shown below. The current I drawn from the battery is : Includes diagram2022 · 26 Jul · Shift 2 · Q52 · MCQ
An aluminium wire is stretched to make its length, 0.4% larger. The percentage change in resistance is :2022 · 26 Jun · Shift 1 · Q53 · MCQ
The equivalent resistance between points A and B in the given network is : Includes diagram2022 · 26 Jun · Shift 2 · Q57 · MCQ
Two sources of equal emfs are connected in series. This combination is connected to an external resistance R. The internal resistances of the two sources are $r_{1}$ and $r_{2}$ $(r_{1} > r_{2})$ . If the potential difference…2022 · 27 Jul · Shift 1 · Q57 · MCQ
In a meter bridge experiment, for measuring unknown resistance 'S', the null point is obtained at a distance $30 cm$ from the left side as shown at point D. If R is $5.6 k Ω$ , then the value of unknown resistance 'S'… Includes diagram2022 · 27 Jul · Shift 1 · Q63 · Numerical
A $1 m$ long copper wire carries a current of $1 A$ . If the cross section of the wire is $2.0 mm^{2}$ and the resistivity of copper is $1.7 \times 1 0^{- 8} Ω m$ , the force experienced by moving…2022 · 27 Jul · Shift 1 · Q67 · Numerical
(A) The drift velocity of electrons decreases with the increase in the temperature of conductor. (B) The drift velocity is inversely proportional to the area of cross-section of given conductor. (C) The drift velocity does not depend on…2022 · 27 Jul · Shift 2 · Q50 · MCQ
In the given figure of meter bridge experiment, the balancing length AC corresponding to null deflection of the galvanometer is $40 cm$ . The balancing length, if the radius of the wire $AB$ is doubled, will be … Includes diagram2022 · 27 Jul · Shift 2 · Q57 · Numerical
A 72 $Ω$ galvanometer is shunted by a resistance of 8 $Ω$ . The percentage of the total current which passes through the galvanometer is :2022 · 27 Jun · Shift 1 · Q47 · MCQ
The current density in a cylindrical wire of radius 4 mm is 4 $\times$ 106 Am $-$ 2. The current through the outer portion of the wire between radial distances $\frac{R}{2}$ and R is $π$ A.2022 · 27 Jun · Shift 1 · Q64 · Numerical
The current density in a cylindrical wire of radius r = 4.0 mm is 1.0 $\times$ 106 A/m2. The current through the outer portion of the wire between radial distances $\frac{r}{2}$ and r is x $π$ A; where x is .2022 · 27 Jun · Shift 2 · Q68 · Numerical
In the given circuit 'a' is an arbitrary constant. The value of m for which the equivalent circuit resistance is minimum, will be $\frac{x}{2}$ . The value of x is . Includes diagram2022 · 27 Jun · Shift 2 · Q69 · Numerical
A wire of resistance R1 is drawn out so that its length is increased by twice of its original length. The ratio of new resistance to original resistance is :2022 · 28 Jul · Shift 1 · Q56 · MCQ
Given below are two statements : Statement I : A uniform wire of resistance $80 Ω$ is cut into four equal parts. These parts are now connected in parallel. The equivalent resistance of the combination will be $5 Ω$ . Statement…2022 · 28 Jul · Shift 2 · Q50 · MCQ
An electrical bulb rated 220 V, 100 W, is connected in series with another bulb rated 220 V, 60 W. If the voltage across combination is 220 V, the power consumed by the 100 W bulb will be about W.2022 · 28 Jul · Shift 2 · Q62 · Numerical
A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 $Ω$ . The galvanometer (G) shows null deflection when tapping key is at 43 cm mark from end A. If the end… Includes diagram2022 · 28 Jun · Shift 1 · Q61 · Numerical
Current measured by the ammeter (A) in the reported circuit when no current flows through 10 $Ω$ resistance, will be A. Includes diagram2022 · 28 Jun · Shift 1 · Q62 · Numerical
Resistance of the wire is measured as 2 $Ω$ and 3 $Ω$ at 10 $^{\circ}$ C and 30 $^{\circ}$ C respectively. Temperature co-efficient of resistance of the material of the wire is :2022 · 28 Jun · Shift 2 · Q60 · MCQ
All resistances in figure are 1 $Ω$ each. The value of current 'I' is $\frac{a}{5}$ A. The value of a is . Includes diagram2022 · 28 Jun · Shift 2 · Q72 · Numerical
Two metallic wires of identical dimensions are connected in series. If $σ_{1}$ and $σ_{2}$ are the conductivities of the these wires respectively, the effective conductivity of the combination is :2022 · 29 Jul · Shift 1 · Q59 · MCQ
The current I flowing through the given circuit will be A. Includes diagram2022 · 29 Jul · Shift 1 · Q71 · Numerical
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils. Reason R: Constantan and manganin have…2022 · 29 Jul · Shift 2 · Q47 · MCQ
A $1 m$ long wire is broken into two unequal parts $X$ and $Y$ . The $X$ part of the wire is streched into another wire W. Length of $W$ is twice the length of $X$ and the resistance of $W$ is…2022 · 29 Jul · Shift 2 · Q48 · MCQ
The variation of applied potential and current flowing through a given wire is shown in figure. The length of wire is 31.4 cm. The diameter of wire is measured as 2.4 cm. The resistivity of the given wire is measured as x $\times$ 10 $-$ 3… Includes diagram2022 · 29 Jun · Shift 1 · Q63 · Numerical
For the network shown below, the value of VB $-$ VA is V. Includes diagram2022 · 29 Jun · Shift 1 · Q66 · Numerical
The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2 $Ω$ . The value of internal resistance of each cell is2022 · 29 Jun · Shift 2 · Q60 · MCQ
Two resistors are connected in series across a battery as shown in figure. If a voltmeter of resistance 2000 $Ω$ is used to measure the potential difference across 500 $Ω$ resistor, the reading of the voltmeter will be … Includes diagram2022 · 29 Jun · Shift 2 · Q65 · Numerical
An electric cable of copper has just one wire of radius 9 mm. Its resistance is 14 $Ω$ . If this single copper wire of the cable is replaced by seven identical well insulated copper wires each of radius 3 mm connected in parallel, then…2022 · 30 Jun · Shift 1 · Q55 · MCQ
Due to cold weather a 1 m water pipe of cross-sectional area 1 cm2 is filled with ice at $-$ 10 $^{\circ}$ C. Resistive heating is used to melt the ice. Current of 0.5A is passed through 4 k $Ω$ resistance. Assuming that all the heat…2021 · 1 Sep · Shift 2 · Q53 · MCQ
Two resistors R1 = (4 $\pm$ 0.8) $Ω$ and R2 = (4 $\pm$ 0.4) $Ω$ are connected in parallel. The equivalent resistance of their parallel combination will be :2021 · 1 Sep · Shift 2 · Q55 · MCQ
A uniform heating wire of resistance 36 $Ω$ is connected across a potential difference of 240 V. The wire is then cut into half and potential difference of 240V is applied across each half separately. The ratio of power dissipation in…2021 · 1 Sep · Shift 2 · Q71 · Numerical
A conducting wire of length 'l', area of cross-section A and electric resistivity $ρ$ is connected between the terminals of a battery. A potential difference V is developed between its ends, causing an electric current. If the length of…2021 · 16 Mar · Shift 1 · Q55 · MCQ
In the figure given, the electric current flowing through the 5 k $Ω$ resistor is 'x' mA. The value of x to the nearest integer is . Includes diagram2021 · 16 Mar · Shift 1 · Q64 · Numerical
A resistor develops 500 J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5A to 3A, what will be the energy developed in 20 s.2021 · 16 Mar · Shift 2 · Q57 · MCQ
The energy dissipated by a resistor is 10 mJ in 1 s when an electric current of 2 mA flows through it. The resistance is $Ω$ . (Round off to the Nearest Integer)2021 · 16 Mar · Shift 2 · Q63 · Numerical
A current of 10A exists in a wire of cross-sectional area of 5 mm2 with a drift velocity of 2 $\times$ 10 $-$ 3 ms $-$ 1. The number of free electrons in each cubic meter of the wire is .2021 · 17 Mar · Shift 1 · Q58 · MCQ
The equivalent resistance of series combination of two resistors is 's'. When they are connected in parallel, the equivalent resistance is 'p'. If s = np, then the minimum value for n is . (Round off to the…2021 · 17 Mar · Shift 1 · Q68 · Numerical
Two cells of emf 2E and E with internal resistance r1 and r2 respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero… Includes diagram2021 · 17 Mar · Shift 2 · Q50 · MCQ
The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of 15 $Ω$ resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10V is maintained… Includes diagram2021 · 17 Mar · Shift 2 · Q56 · MCQ
In the experiment of Ohm's law, a potential difference of 5.0 V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error…2021 · 18 Mar · Shift 1 · Q56 · MCQ
The voltage across the 10 $Ω$ resistor in the given circuit is x volt. The value of 'x' to the nearest integer is . Includes diagram2021 · 18 Mar · Shift 1 · Q64 · Numerical
Two wires of same length and thickness having specific resistances 6 $Ω$ cm and 3 $Ω$ cm respectively are connected in parallel. The effective resistivity is $ρ Ω$ cm. The value of $ρ$ , to the nearest integer, is …2021 · 18 Mar · Shift 2 · Q61 · Numerical
Consider a 72 cm long wire AB as shown in the figure. The galvanometer jockey is placed at P on AB at a distance x cm from A. The galvanometer shows zero deflection. The value of x, to the nearest integer, is . Includes diagram2021 · 18 Mar · Shift 2 · Q62 · Numerical
A current of 5 A is passing through a non-linear magnesium wire of cross-section 0.04 m2. At every point the direction of current density is at an angle of 60 $^{\circ}$ with the unit vector of area of cross-section. The magnitude of…2021 · 20 Jul · Shift 1 · Q47 · MCQ
The value of current in the 6 $Ω$ resistance is : Includes diagram2021 · 20 Jul · Shift 1 · Q54 · MCQ
In the given figure switches S1 and S2 are in open condition. The resistance across ab when the switches S1 and S2 are closed is $Ω$ . Includes diagram2021 · 20 Jul · Shift 2 · Q66 · Numerical
A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2 is joined with a similar Aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B. (Take Resistivity of Copper = 1.7 $\times$ 10… Includes diagram2021 · 22 Jul · Shift 2 · Q48 · MCQ
In an electric circuit, a cell of certain emf provides a potential difference of 1.25 V across a load resistance of 5 $Ω$ . However, it provides a potential difference of 1 V across a load resistance of 2 $Ω$ . The emf of the cell…2021 · 22 Jul · Shift 2 · Q71 · Numerical
A current through a wire depends on time as i = $α$ 0t + $β$ t2 where $α$ 0 = 20 A/s and $β$ = 8 As $-$ 2. Find the charge crossed through a section of the wire in 15 s.2021 · 24 Feb · Shift 1 · Q47 · MCQ
A cell E1 of emf 6V and internal resistance 2 $Ω$ is connected with another cell E2 of emf 4V and internal resistance 8 $Ω$ (as shown in the figure). The potential difference across points X and Y is : Includes diagram2021 · 24 Feb · Shift 1 · Q51 · MCQ
A cylindrical wire of radius 0.5 mm and conductivity 5 $\times$ 107 S/m is subjected to an electric field of 10 mV/m. The expected value of current in the wire will be x3 $π$ mA. The value of x is .2021 · 24 Feb · Shift 2 · Q63 · Numerical
A current of 6A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2 $Ω$ each and leaves by the corner R. The currents i1 in ampere is . Includes diagram2021 · 25 Feb · Shift 2 · Q76 · Numerical
An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance 'R' that must be put in series with the bulb so that the bulb delivers the same power is $Ω$ .2021 · 25 Jul · Shift 1 · Q69 · Numerical
A 16 $Ω$ wire is bend to form a square loop. A 9V supply having internal resistance of 1 $Ω$ is connected across one of its sides. The potential drop across the diagonals of the square loop is $\times$ …2021 · 25 Jul · Shift 2 · Q66 · Numerical
In the given figure, the emf of the cell is 2.2 V and if internal resistance is 0.6 $Ω$ . Calculate the power dissipated in the whole circuit : Includes diagram2021 · 26 Aug · Shift 1 · Q54 · MCQ
What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent resistance of 3 $Ω$ ? (Given resistivities of iron and copper-nickel alloy wire are 12 $μ Ω$ and 51 $μ Ω$ …2021 · 26 Aug · Shift 1 · Q58 · MCQ
If you are provided a set of resistances 2 $Ω$ , 4 $Ω$ , 6 $Ω$ and 8 $Ω$ . Connect these resistances so as to obtain an equivalent resistance of $\frac{46}{3} Ω$ .2021 · 26 Aug · Shift 2 · Q53 · MCQ
An electric bulb of 500 watt at 100 volt is used in a circuit having a 200 V supply. Calculate the resistance R to be connected in series with the bulb so that the power delivered by the bulb is 500 W.2021 · 26 Aug · Shift 2 · Q57 · MCQ
Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is : Includes diagram2021 · 26 Feb · Shift 1 · Q63 · MCQ
In an electrical circuit, a battery is connected to pass 20C of charge through it in a certain given time. The potential difference between two plates of the battery is maintained at 15V. The workdone by the battery is …2021 · 26 Feb · Shift 1 · Q68 · Numerical
A wire of 1 $Ω$ has a length of 1 m. It is stretched till its length increases by 25%. The percentage change in resistance to the nearest integer is :2021 · 26 Feb · Shift 2 · Q55 · MCQ
Five identical cells each of internal resistance 1 $Ω$ and emf 5V are connected in series and in parallel with an external resistance 'R'. For what value of 'R', current in series and parallel combination will remain the same?2021 · 27 Aug · Shift 1 · Q57 · MCQ
First, a set of n equal resistors of 10 $Ω$ each are connected in series to a battery of emf 20V and internal resistance 10 $Ω$ . A current I is observed to flow. Then, the n resistors are connected in parallel to the same…2021 · 27 Aug · Shift 1 · Q62 · Numerical
For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be :2021 · 27 Aug · Shift 2 · Q50 · MCQ
The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed is x : 8. The value of x is . Includes diagram2021 · 27 Aug · Shift 2 · Q65 · Numerical
In the given figure, a battery of emf E is connected across a conductor PQ of length 'l' and different area of cross-sections having radii r1 and r2 (r2 < r1). Choose the correct option as one moves from P to Q : Includes diagram2021 · 27 Jul · Shift 1 · Q48 · MCQ
The resistance of a conductor at 15 $^{\circ}$ C is 16 $Ω$ and at 100 $^{\circ}$ C is 20 $Ω$ . What will be the temperature coefficient of resistance of the conductor?2021 · 27 Jul · Shift 2 · Q62 · MCQ
For the circuit shown, the value of current at time t = 3.2 s will be A. [Voltage distribution V(t) is shown by Fig. (1) and the circuit is shown in Fig. (2)] Includes diagram2021 · 27 Jul · Shift 2 · Q68 · Numerical
Consider a galvanometer shunted with 5 $Ω$ resistance and 2% of current passes through it. What is the resistance of the given galvanometer ?2021 · 31 Aug · Shift 1 · Q63 · MCQ
A square shaped wire with resistance of each side 3 $Ω$ is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in unit of $Ω$ will be .2021 · 31 Aug · Shift 1 · Q66 · Numerical
The voltage drop across 15 $Ω$ resistance in the given figure will be V. Includes diagram2021 · 31 Aug · Shift 1 · Q68 · Numerical